onPropsChanged( )

Adds an event handler that runs when the value of a widget property is changed.

A widget receives an onPropsChanged event when one or more of its properties is changed via its API.

Method Declaration
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Method Parameters
handlerfunctionRequired

handler(oldProps: object, newProps: object): void The name of the function or the function expression to run when the value of a widget property is changed.

Returns
Return Type:any
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